1997 Jul 15

16

Philips Semiconductors

Product specification

Clock/calendar with 240

× 8-bit RAM

PCF8583

9.1

Addressing

always carried out with the first byte transmitted after the start procedure.

The clock/calendar acts as a slave receiver or slave transmitter. Therefore the clock signal SCL is only an input signal,

but the data signal SDA is a bidirectional line.

The clock/calendar slave address is shown in Fig.16. Bit A0 corresponds to hardware address pin A0. Connecting this

9.2

Clock/calendar READ/WRITE cycles

Fig.16 Slave address.

handbook, halfpage

MRB016

101

00

0

A0 R/W

group 1

group 2

Fig.17 Master transmits to slave receiver (WRITE) mode.

handbook, full pagewidth

S

0A

SLAVE ADDRESS

WORD ADDRESS

A

A

DATA

P

acknowledgement

from slave

acknowledgement

from slave

acknowledgement

from slave

R/W

auto increment

memory word address

MBD822

n bytes